जैविक खाद मुख्य रूप से निम्नलिखित में से किसे बढ़ाकर मिट्टी में पोषक तत्वों की उपलब्धता में सुधार करती है?

What is the primary objective of soil test-based fertilizer application?

Continuous and exclusive use of chemical nitrogenous fertilizers without organic matter often leads to what?

Which of the following types of soil is considered the best for the healthy growth of most plants?